Sinson Varghese
Thrissur
Summary
Dynamic Senior Network Engineer with proven expertise at CallTek Inc., specializing in enterprise network design and SD-WAN deployment. Adept at mentoring teams and optimizing network infrastructures, achieving 100% GPNS compliance while enhancing troubleshooting workflows. Skilled in FortiGate firewalls and committed to delivering exceptional technical support and strategic solutions.
Overview
1
1
Certification
12
12
years of professional experience
Work History
Senior Network Engineer
CallTek Inc.
12.2022 - Current
- Project: Cloud5 Communications
- Lead end-to-end remote network engineering infrastructure design and senior technical support across large-scale enterprise hospitality portfolios, ensuring strict adherence to global brand standards.
- Function as senior engineering authority for NOC, managing and resolving complex tier 2 escalations through advanced root-cause analysis.
- Facilitate mentorship and guidance for junior technical team members to enhance remote troubleshooting workflows and decrease mean time to resolution (MTTR).
- Established optimized, and sustained robust network infrastructures for premium Marriott properties globally, ensuring 100% adherence to stringent GPNS standards.
- Utilized centralized cloud platforms (Ruckus VSZ, Aruba Central, Meraki Dashboard) to implement zero-touch provisioning and manage remote configurations for over 100 global nodes without physical access.
- Implemented and administered enterprise SD-WAN environments utilizing FortiGate and Velocloud orchestrator to establish intelligent traffic steering, link redundancy, and sub-second failover.
- Constructed secure site-to-site and remote access VPN tunnels (IPSec/SSL) for reliable connectivity between property networks and centralized data centers.
- Engineered dedicated secure vendor networks to isolate third-party hospitality systems (IoT smart-room tech, IPTV, CCTV) from core guest and admin networks, mitigating corporate security risks.
- Orchestrated high-profile conference network builds, provisioning custom bandwidth limits, dedicated VLANs, and tailored captive portals for corporate events.
- Directed real-time incident resolution, conducting root-cause analysis, and ensuring strict SLA compliance utilizing ServiceNow and Salesforce.
- Led seamless integration of network routing with hospitality property management systems (PMS), including Opera, Fosse, and Galaxy across full-service hotel properties.
- Evaluated and enhanced network performance to fully comply with 110s operational frameworks.
Network and System Administrator
Valappila Communications
01.2018 - 01.2022
- Managed and optimized core switching and routing environments utilizing multi-vendor hardware, including Cisco and HP enterprise switches.
- Administered localized network systems, ensuring high availability of critical infrastructure protocols, including DNS, DHCP, and centralized server virtualizations.
- Migrated legacy, outdated network setups into modern, high-availability, segmented topologies, drastically reducing operational network overhead.
System Administrator
IndiaOptions
01.2015 - 01.2017
- Managed enterprise system deployments, user access controls, Active Directory services, and corporate endpoint security policies.
- Maintained internal corporate network systems, troubleshooting and resolving day-to-day hardware, software, and localized connectivity issues.
Field Engineer
TCC
01.2014 - 01.2015
- Executed hardware deployments, structured cabling, rack installations, and baseline configurations of networking equipment to ensure readiness for operational use.
- Conducted wireless RF surveys and validation testing to ensure optimal signal strength and coverage in deployment zones.
Education
B.Sc. - Computer Science
Annamalai University
3-Year Diploma - Computer Networking
Technical Board of Kerala
Skills
- Enterprise Network Design
- Network Architecture
- Fortigate SD-WAN
- Fortigate firewall
- Ruckus vSZ/ZD
- Aruba Central
- Cisco Meraki Dashboard
- Velocloud Orchestrator
- Wireless Network Management
- Cisco Switches
- Site-to-Site VPN
- Firewall high availability
- Load Balancing
- Traffic Steering
- HTTPS
- DNS
- DHCP Scope Management
- TCP/IP
- VLAN Routing
- IPAM
- Network Firmware Upgrades
- Captive portal configuration
- Conference Network Builds
- WatchGuard
- SolarWinds
- IT Service Management
- Tier 2 Escalation Management
- Customer Relationship Management
- HP Wireless Conductors
- Nomadix AP Replacement
Certification
- CCNP Enterprise – Cisco Certified Network Professional
- CCNA – Cisco Certified Network Associate
- RSZA – Ruckus SmartZone Administrator
- RICXI – Ruckus ICX Implementer
Technical Skills
Marriott GPNS (Global Property Network Standards), 110S Frameworks, Ruckus vSZ/ZD, Aruba Central, Cisco Meraki Dashboard, HP Wireless Conductors, Fortigate SD-WAN, Velocloud Orchestrator, Site-to-Site VPN (IPSec/SSL), Firewall HA Clusters (Active-Active/Active-Passive), Load Balancing, Traffic Steering, Fortinet Fortigate, WatchGuard, Nomadix Gateways, Cisco Switches, Vendor Isolation, HTTPS, DNS, DHCP Scope Management, TCP/IP, VLAN Routing, IPAM, Conference Network Builds, Bandwidth Allocation, Captive Portal Customization, Tier 2 Escalation Management, Network Firmware Upgrades, Nomadix AP Replacement, SolarWinds, Helios, ServiceNow, Salesforce
Personal Information
Available: Permanent Remote & Flexible/Global Shifts
Timeline
Senior Network Engineer
CallTek Inc.
12.2022 - Current
Network and System Administrator
Valappila Communications
01.2018 - 01.2022
System Administrator
IndiaOptions
01.2015 - 01.2017
Field Engineer
TCC
01.2014 - 01.2015
B.Sc. - Computer Science
Annamalai University
3-Year Diploma - Computer Networking
Technical Board of Kerala